/*
 *   Licensed to the Apache Software Foundation (ASF) under one
 *   or more contributor license agreements.  See the NOTICE file
 *   distributed with this work for additional information
 *   regarding copyright ownership.  The ASF licenses this file
 *   to you under the Apache License, Version 2.0 (the
 *   "License"); you may not use this file except in compliance
 *   with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing,
 *   software distributed under the License is distributed on an
 *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *   KIND, either express or implied.  See the License for the
 *   specific language governing permissions and limitations
 *   under the License.
 *
 */

package org.apache.directory.server.codec.json.operations.search;


import java.lang.reflect.Type;
import java.util.Iterator;

import org.apache.directory.server.codec.json.JsonBuilder;
import org.apache.directory.shared.ldap.entry.DefaultEntry;
import org.apache.directory.shared.ldap.entry.DefaultEntryAttribute;
import org.apache.directory.shared.ldap.entry.Entry;
import org.apache.directory.shared.ldap.entry.EntryAttribute;
import org.apache.directory.shared.ldap.exception.LdapException;
import org.apache.directory.shared.ldap.name.DN;
import org.apache.directory.shared.ldap.schema.SchemaManager;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;


/**
 * TODO EntryEncoder.
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class DefaultEntryCodec implements JsonSerializer<DefaultEntry>, JsonDeserializer<DefaultEntry>
{

    public JsonElement serialize( DefaultEntry entry, Type typeOfSrc, JsonSerializationContext context )
    {
        return _serialize( entry, typeOfSrc, context );
    }


    public DefaultEntry deserialize( JsonElement json, Type typeOfT, JsonDeserializationContext context )
        throws JsonParseException
    {
        return _deserialize( json, typeOfT, context );
    }


    public static DefaultEntry _deserialize( JsonElement element, Type typeOfT, JsonDeserializationContext context )
    {
        try
        {

            JsonObject json = element.getAsJsonObject();

            DN dn = JsonBuilder.decodeDn( json.get( "dn" ) );

            SchemaManager sm = JsonBuilder.getSchemaManager();

            DefaultEntry entry = null;

            if ( sm != null )
            {
                entry = new DefaultEntry( sm, dn );
            }
            else
            {
                entry = new DefaultEntry( dn );
            }

            JsonElement attributes = json.get( "attributes" );
            if ( attributes != null )
            {
                JsonArray atArray = attributes.getAsJsonArray();
                Iterator<JsonElement> itr = atArray.iterator();
                while ( itr.hasNext() )
                {
                    DefaultEntryAttribute at = JsonBuilder.get().fromJson( itr.next(), DefaultEntryAttribute.class );
                    entry.add( at );
                }
            }

            return entry;
        }
        catch ( LdapException e )
        {
            throw new JsonParseException( e );
        }

    }


    public static JsonElement _serialize( Entry entry, Type typeOfSrc, JsonSerializationContext context )
    {
        JsonObject json = new JsonObject();

        DN dn = entry.getDn();
        if ( dn == null )
        {
            dn = DN.EMPTY_DN;
        }

        json.addProperty( "dn", dn.getName() );

        JsonArray ja = new JsonArray();

        Gson builder = JsonBuilder.get();

        for ( EntryAttribute at : entry )
        {
            ja.add( builder.toJsonTree( at ) );
        }

        if ( ja.size() > 0 )
        {
            json.add( "attributes", ja );
        }

        return json;
    }

}
